# US 9,534,880 B2 · Liquid electrically initiated and controlled gas generator composition

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- Number: US 9,534,880 B2
- Document ID: US9534880B2
- Status: Granted
- Kind: B2
- Application number: 15/144,701
- Filed: 2016-05-02
- Published: 2016-08-25
- Granted: 2017-01-03
- Earliest claimed: 2012-10-24
- Assignees: Digital Solid State Propulsion, LLC
- Applicants: Digital Solid State Propulsion LLC
- Inventors: Michael D. McPherson; Tim Manship
- Web page: https://patentgrep.com/patent/US9534880B2

## CPC

- F42D 1/045: Arrangements for electric ignition (dynamo-electric generators H02K)
- C06B 23/005: {Desensitisers, phlegmatisers (coolants for mining explosives C06B23/04; deactivating C06B21/0091)}
- C06B 23/006: {Stabilisers (e.g. thermal stabilisers) (processes C06B21/0091; foam stabilisers C06B23/002)}
- C06B 23/007: {Ballistic modifiers, burning rate catalysts, burning rate depressing agents, e.g. for gas generating}
- C06B 25/34: the compound being a nitrated acyclic, alicyclic or heterocyclic amine
- C06B 31/00: Compositions containing an inorganic nitrogen-oxygen salt
- C06B 31/28: the salt being ammonium nitrate
- C06B 47/00: Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase
- F42D: BLASTING (fuses, e.g. fuse cords, C06C5/00; {for obtaining fluid from wells E21B43/00; for mining or quarrying E21C37/00; for making tunnels or galleries E21D9/006}; cartridges F42B3/00)
- C06B: EXPLOSIVES OR THERMIC COMPOSITIONS (blasting F42D); MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES (compounds in general C01, C07 or C08; {demolition agents based on cementitious or like materials C04B41/0009})

## Abstract

A liquid electrically initiated and controlled composition comprising an oxidizer, soluble fuel additive(s), and other optional additives to enhance the chemical or ballistic properties, or a combination thereof is disclosed. The liquid composition further comprises stabilizers to enhance thermal stability, sequestrants to minimize deleterious effects of transition metal contaminants, and combustion enhancers maximizing efficiency. Buffers and heavy metal sequestering or complexing agents may be used in combination to achieve the highest degree of thermal stability. Additional ionic co-oxidizers may be added to the liquid composition to stabilize the liquid oxidizer and further depress freezing point. The liquid phase of matter allows flow via pipes or tubes from tanks, reservoirs, or other containers, through metering valves, followed by ignition or combustion modulation when stimulated by electrodes, statically or dynamically.

## Claims

### Claim 1

A method of controlling gas generation, the method comprising the steps of:
a. providing an electrically controlled gas generator composition comprising:
i. oxidizer at 65-79 percent by weight;
ii. fuel additive at 15-30 percent by weight; and
iii. a stabilizer and sequestrant at 0.1-1.0 percent by weight;
iv. a buffer at 0.1-1.0 percent by weight; and
v. a co-oxidizer;
b. providing an electrode in contact with said gas generator composition; and
c. applying an electrical voltage to said gas generator composition via said electrode.

### Claim 2 (depends on 1)

The method according to claim 1 wherein the oxidizer is hydroxylammonium nitrate (HAN).

### Claim 3 (depends on 1)

The method according to claim 1 wherein the fuel additive is selected from the group consisting of cyclic saccharides, complex sugars/polysaccharides and polyhydroxyl compounds soluble in liquid HAN oxidizer matrix.

### Claim 4 (depends on 1)

The method according to claim 1 wherein the stabilizer and sequestrant is 2,2′-Bipyridyl.

### Claim 5 (depends on 1)

The method according to claim 1 wherein the buffer is ammonium dihydrogen phosphate.

### Claim 6 (depends on 1)

The method according to claim 1 wherein said gas generator composition further comprises a desensitizer at 1-3 percent by weight.

### Claim 7 (depends on 6)

The method according to claim 6 wherein the desensitizer is water.

### Claim 8 (depends on 1)

The method according to claim 1 wherein said gas generator composition further comprises a surfactant at 0.1-0.5 percent by weight.

### Claim 9 (depends on 8)

The method according to claim 8 wherein the surfactant is n-octanol.

### Claim 10 (depends on 1)

The method according to claim 1 wherein said gas generator composition further comprises a combustion enhancer at 1-3 percent by weight.

### Claim 11 (depends on 10)

The method according to claim 10 wherein the combustion enhancer is a polynitrogen compound selected from the group consisting of 5-aminotetrazole and 1,2,4-triazole.

### Claim 12 (depends on 1)

The method according to claim 1 wherein said gas generator composition further comprises a co-oxidizer at 2-7 percent by weight.

### Claim 13 (depends on 12)

The method according to claim 12 wherein the co-oxidizer is selected from the group consisting of ammonium nitrate, methyl ammonium nitrate and hydroxyethylammonium formate.